Unity will support HTML5 at some point

Helgason said he wants Unity to be ready for “the moment HTML5 is right for games”

The current hold back he cites is that JavaScript isn’t ready yet in terms of performance – but with the amount of research going into making JavaScript performant by the browser vendors, hopefully that will be sooner rather than later.

With the rise of HTML5 technology, large platforms such as Facebook have used it to power their games system within Facebook Messenger. This allows developers to create interesting content to reach massive audiences.